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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15ab5ee587a689d21c89c061dc86332c247aebf54bf2140eb84dbeae5251227' 
  AND token = 'D9g65cd/c+i+pb3g049iKhSrk6mKnX8gQ7ZPPKpOkhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}